Whilst it is difficult to short specs like ADO and HTX, it is not impossible. There have been posters claim to have shorted ADO, and I have followed their posts long enough to believe it is possible if you have the right connections.
I don't know of anyone actively shorting it at the moment, but the action on ADO has been a little odd. The selling of ADO in the 6s, is a bit like the selling of HTX has been in the 20s.... massive volume without it breaking out.
The good thing about HTX (and ADO) is they are both on the brink of sales volumes, breaking new ground in their fields.
By the way, even in specs, charts are important. Anything that influences the way people buy and sell should be understood and respected.... IMHO.
HTX Price at posting:
17.5¢ Sentiment: Buy Disclosure: Held